number 7 plastic is bad. dont drink from them.

Plastic is not a element. It has not a atomic number.

to determine the number of times the plastic can be recycled

Plastic newspaper sleeves can be reused in a number of ways. If you have a dog, these plastic sleeves can be used to clean up after them when on a walk.

Hard plastic has a number of potential uses. It can be used for making glass like bottles, packaging as well as a number of electrical devices such as computers and iPods.